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As scientists raced to develop Covid-19 vaccines, public health specialists were hoping that more than one group would succeed. Having multiple companies producing vaccines would make it easier to inoculate a lot of people fast. Be careful what you wish for. A range of vaccines with different efficacy results now has given rise to worries that some people may refuse the shot on offer in hopes of getting a "better" one later. In reality, comparing efficacy numbers isn't necessarily the best way t
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 The global tally of confirmed cases of the coronavirus-borne illness COVID-19 climbed above 134 million on Friday and the death toll edged closer to 3 million, as controversy continued to swirl around the vaccine developed by AstraZeneca PLC and Oxford University that one regulator said could cause blood clots in very rare instances.
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